CN103541036A - High-strength polypropylene crude fiber containing carbon-fiber compound nucleating agent for concrete reinforcing, and preparation method thereof - Google Patents
High-strength polypropylene crude fiber containing carbon-fiber compound nucleating agent for concrete reinforcing, and preparation method thereof Download PDFInfo
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- CN103541036A CN103541036A CN201310411207.3A CN201310411207A CN103541036A CN 103541036 A CN103541036 A CN 103541036A CN 201310411207 A CN201310411207 A CN 201310411207A CN 103541036 A CN103541036 A CN 103541036A
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Abstract
The invention relates to a high-strength polypropylene crude fiber containing a carbon-fiber compound nucleating agent for concrete reinforcing, and a preparation method thereof. The polypropylene crude fiber provided by the invention is a mixture of 90-99% of polypropylene, 0.1-2.5% of nucleating agent, 0.5-5% of bulking agent, 0.1-1.5% of antioxidant and 0.1-1% of ultraviolet absorbent. The preparation method comprises the following steps of: firstly, drying the nucleating agent till constant weight and then mixing the nucleating agent with other materials proportionally into a mixture; extruding the mixture through a twin-screw extruder and spinning by a spinneret plate; carrying out water cooling, hot water drafting, hot roller drafting and heat setting to obtain the crude fiber. According to the invention, the high-strength and high-modulus polypropylene crude fiber is obtained by modifying polypropylene by using the organic/inorganic compound nucleating agent. The method provided by the invention has the advantage that modification and spinning processes are completed through one step, and is more advantageous for simplifying the production process and reducing the product cost.
Description
Technical field
The invention belongs to technical field of polymer materials, relate to a kind of high-strength polypropylene crude fibre and preparation method thereof, particularly a kind of concrete that contains the composite nucleator of carbon fiber strengthening for concrete strengthens with high-strength polypropylene crude fibre and preparation method thereof.
Background technology
Concrete, because it has advantages of that compression strength is high, is widely used in comprising the multiple occasions with different stress characteristic and performance requirement such as house, bridge, dam, airport, highway, railway, harbour, is one of construction material of current large usage quantity.But the shortcomings such as it also exists poor toughness, tensile strength is low, fragility is large, easy to crack.Therefore, improve concrete tensile strength and toughness, extending its engineering is the important directions that improves concrete performance service life, has important using value.
By concrete is mixed to increase concrete tensile strength with various fibers, it is the method being widely used at present.Wherein polypropylene fibre can effectively improve concrete impact flexibility and cracking resistance, freeze proof, impermeability, self have good chemical stability simultaneously, good in dispersed, acid and alkali-resistance, the feature such as corrosion-resistant and be widely used as a kind of fibrous material that concrete strengthens.
Application number is that 01142105.3 Chinese patent discloses a kind of for improving polypropylene fibre of concrete cracking defect and preparation method thereof, by being added to, Modified Polymer resin in acrylic resin, carries out melt spinning, spinning temperature is 240～310 ℃, and carry out surface treatment with alkyl phosphoric acid monoethanolamine, the fiber obtaining and concrete binding strengthen, and better with cement matrix compatibility, thus concrete crack resistance improved, have the advantages that to prevent concrete cracking.Application number is that 98103243.5 Chinese patent has proposed to use fine PP fiber reinforced cement based composite material.Be mainly used in massive water projects and storage tank that anti-cracking and antiseep are had relatively high expectations.Wherein cement matrix is 100 parts, fine PP fiber 0.005～0.5, and the filament length of fine PP fiber is 0.5～20.dtex, length is 3～50mm.Application number is 96116519.7 Chinese patent, has announced a kind of used for preventing cement from cracking crude polypropylene fiber, and this fiber is porous surface, and cross section is Y type, mixes 0.9kg/m in cement concrete
3this fiber can significantly improve the mechanical property of cement products.Application number is 200810021644.3 Chinese patent, has announced a kind of crude polypropylene fiber for concrete and preparation method thereof.This patent adopts amorphous silica, silicon ash to live one or more of flyash as interface modifier, and adds a certain amount of polypropylene white master batch, and antioxidant and ultraviolet absorber, make a kind of modified polypropylene fiber.The interface modifier of this kind of fiber surface can participate in hydration reaction, improves the interface adhesion of fiber and cement matrix, and the dispersiveness of fortifying fibre in cement makes fiber be given full play to the enhancing toughening effect of cement concrete.
The discloseder PP fiber reinforced cement concretes of above-mentioned patent, are mainly to take to increase fiber surface roughness, improve the methods such as fiber and concrete interface performance and improve concrete intensity and crack resistance.But the polypropylene fibre by above method modification improves very limited to concrete toughness and crack resistance.
Adopting polypropylene fibre to prepare in the method for high performance concrete, the modulus of polypropylene fibre and intensity directly affect concrete toughness and cracking resistance.In order to obtain the fiber of high strength and modulus, this patent adopts usings carbon fiber and is added in polypropylene as inorganic constituents in organic principle in nucleator and nucleator is composite, being added in when promoting that polyacrylic heterogeneous nucleation improves crystalling propylene degree of this nucleator, can induce crystalling propylene to be orientated along fibre single thread direction, make crude polypropylene fiber anisotropy, thereby be more conducive to promote crude polypropylene fiber in the intensity modulus of draw direction.
Summary of the invention
An object of the present invention is for the deficiencies in the prior art, provide a kind of concrete that contains the composite nucleator of carbon fiber to strengthen and use high-strength polypropylene crude fibre, this fiber has higher strength and modulus, can be used for preparing high-performance concrete material.
It is blend with high-strength polypropylene crude fibre that the concrete that contains the composite nucleator of carbon fiber of the present invention strengthens, and this blend comprises polypropylene, nucleator, bulking agent, antioxidant, ultraviolet absorber; Each raw material strengthens at the concrete that contains the composite nucleator of carbon fiber: polypropylene 90～99 ﹪, nucleator 0.1～2.5 ﹪, bulking agent 0.5～5 ﹪, antioxidant 0.1～1.5 ﹪, ultraviolet absorber 0.1～1 ﹪;
Described polypropylene is the homopolymers of isotacticity >=97 ﹪, and melt index is 3～40g/10min;
Described nucleator is that organic-inorganic is re-dubbed core agent; It is that 1:20～20:1 forms by organic principle and inorganic constituents according to mass ratio that this organic-inorganic is re-dubbed core agent, and wherein organic principle is carbon fiber, and inorganic constituents is one or more in attapulgite, calcium carbonate, silica, imvite.
The length of described carbon fiber is 2～10mm, and carbon fiber filament number is 0.7～1.5dtex.
Described bulking agent is one or more in maleic anhydride inoculated polypropylene, acrylic acid-grafted polypropylene, acrylamide graft polypropylene, methacrylic acid graft polypropylene, glycidyl methacrylate graft polypropylene; The effect of bulking agent is the compatibility improving between inorganic filler and polypropylene, strengthens interface adhesion, improves the mechanical property of material.
Described antioxidant is a kind of in antioxidant 1010, antioxidant b215, antioxidant 168, antioxidant 1076, antioxidant b225; The effect of antioxidant is to reduce oxidative degradation in crude polypropylene fiber process.
Described ultraviolet absorber is a kind of in UV-12, UV-326, UV-327, UV-328, UV-329, UV-770; The effect of ultraviolet absorber is the light aging reducing in crude polypropylene fiber use procedure.
Another object of the present invention is just to provide the above-mentioned concrete that contains the composite nucleator of carbon fiber of preparation and strengthens by the coarse-fibred method of high-strength polypropylene.
Preparing this concrete that contains the composite nucleator of carbon fiber strengthens by the coarse-fibred method of high-strength polypropylene specifically:
Step (1). first nucleator is dried to constant weight, then by polypropylene, nucleator, bulking agent, antioxidant, ultraviolet absorber, is proportionally mixed into compound;
The concrete that contains the composite nucleator of carbon fiber of preparing 100 weight portions strengthens uses high-strength polypropylene crude fibre, and each amount of substance used is: the polypropylene of 90～99 parts, the nucleator of 0.1～2.5 part, the bulking agent of 0.5～5 part, the antioxidant of 0.1～1.5 part, the ultraviolet absorber of 0.1～1 part.
Step (2). compound is extruded by double screw extruder, and by spinnerets spray silk, then through water hot water or cold water drawing-off, hot-rolling drawing-off, HEAT SETTING, obtain high-strength polypropylene crude fibre.
The processing temperature of described double screw extruder is: 120～150 ℃ of feeding sections, 150～180 ℃ of fluxing zones, 180～205 ℃ of homogenizing zones, and 180～195 ℃ of head temperatures, screw speed is 80～250rpm.
The temperature of described spinnerets is 250～270 ℃; Spinnerets mouth mould is shaped as a kind of in circle, ellipse, triangle, square.
Described water-cooled is the water-bath quenching through 10～40 ℃ by the polymer melt after spray silk, forms low-crystallinity polypropylene fibre, is convenient to obtain higher draw ratio and the degree of orientation in stretching;
The bath temperature of described hot water drawing-off is 60～95 ℃, and drawing-off multiplying power is 2～6 times;
The drawing temperature of described hot-rolling drawing-off is 120～150 ℃, and drawing-off multiplying power is 1.5～6 times;
Described heat setting temperature is 110～150 ℃, and the time is 15s～5min.
The present invention adopts the composite nucleater modified polypropylene of organic-inorganic, and induction polypropylene, along the direction crystallization of carbon fiber monofilament, makes material anisotropy, thereby promotes crude polypropylene fiber in the intensity of draw direction, obtains the crude polypropylene fiber of high strength and modulus.Crude polypropylene fiber of the present invention can strengthen concrete intensity, extends its service life.The inventive method modification and spinning technique one step complete, and are more conducive to simplify production technology, reduce product cost.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is further analyzed that (polypropylene used is the homopolymers of isotacticity >=97 ﹪, and melt index is 3～40g/10min; The length of carbon fiber is 2～10mm, and carbon fiber filament number is 0.7～1.5dtex).
Embodiment 1.
Step (1). 96g polypropylene, 3.5g maleic anhydride inoculated polypropylene, 0.3g antioxidant 1010,0.2g ultraviolet absorber UV-12 are mixed into 100g compound;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 150 ℃ of feeding sections, 180 ℃ of fluxing zones, 190 ℃ of homogenizing zones, 185 ℃ of head temperatures, screw speed is 200rpm; By 250 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle again, then through 10 ℃ of water-bath water-cooleds, in 60 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 5 times, then carries out hot-rolling drawing-off at 120 ℃, drawing-off multiplying power is 4 times, and HEAT SETTING 5min at last 110 ℃, obtains crude polypropylene fiber.
The crude polypropylene fiber equivalent diameter that embodiment 1 prepares is 1mm, and fracture strength is 510Mpa, and elastic modelling quantity is 4000Mpa, and elongation at break is 14 ﹪.
Embodiment 2.
Step (1). attapulgite=1:20), 3.5g maleic anhydride inoculated polypropylene, 0.3g antioxidant 1010,0.2g ultraviolet absorber UV-12 be mixed into 100g compound by 94.5g polypropylene, the composite nucleator of 1.5g carbon fiber-attapulgite (carbon fiber:;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 150 ℃ of feeding sections, 180 ℃ of fluxing zones, 190 ℃ of homogenizing zones, 185 ℃ of head temperatures, screw speed is 200rpm; By 250 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle again, then through 10 ℃ of water-bath water-cooleds, in 60 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 5 times, then carries out hot-rolling drawing-off at 120 ℃, drawing-off multiplying power is 4 times, and HEAT SETTING 5min at last 110 ℃, obtains crude polypropylene fiber.
The crude polypropylene fiber equivalent diameter that embodiment 2 prepares is 1mm, and fracture strength is 660Mpa, and elastic modelling quantity is 12200Mpa, and elongation at break is 26 ﹪.
Embodiment 3.
Step (1). attapulgite=1:20), 3.5g maleic anhydride inoculated polypropylene, 0.3g antioxidant 1010,0.2g ultraviolet absorber UV-12 be mixed into 100g compound by 95g polypropylene, the composite nucleator of 1g carbon fiber-attapulgite (carbon fiber:;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 150 ℃ of feeding sections, 180 ℃ of fluxing zones, 190 ℃ of homogenizing zones, 185 ℃ of head temperatures, screw speed is 200rpm; By 250 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle again, then through 10 ℃ of water-bath water-cooleds, in 60 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 5 times, then carries out hot-rolling drawing-off at 120 ℃, drawing-off multiplying power is 4 times, and HEAT SETTING 5min at last 110 ℃, obtains crude polypropylene fiber.
The crude polypropylene fiber equivalent diameter that embodiment 3 prepares is 1mm, and fracture strength is 598Mpa, and elastic modelling quantity is 7900Mpa, and elongation at break is 19 ﹪.
Embodiment 4.
Step (1). attapulgite=1:20), 3.5g maleic anhydride inoculated polypropylene, 0.3g antioxidant 1010,0.2g ultraviolet absorber UV-12 be mixed into 100g compound by 94.7g polypropylene, the composite nucleator of 1.3g carbon fiber-attapulgite (carbon fiber:;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 150 ℃ of feeding sections, 180 ℃ of fluxing zones, 190 ℃ of homogenizing zones, 185 ℃ of head temperatures, screw speed is 200rpm; By 250 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle again, then through 10 ℃ of water-bath water-cooleds, in 60 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 5 times, then carries out hot-rolling drawing-off at 120 ℃, drawing-off multiplying power is 4 times, and HEAT SETTING 5min at last 110 ℃, obtains crude polypropylene fiber.
The crude polypropylene fiber equivalent diameter that embodiment 4 prepares is 1mm, and fracture strength is 630Mpa, and elastic modelling quantity is 10750Mpa, and elongation at break is 22 ﹪.
Embodiment 5.
Step (1). attapulgite=1:20), 3.5g maleic anhydride inoculated polypropylene, 0.3g antioxidant 1010,0.2g ultraviolet absorber UV-12 be mixed into 100g compound by 94.8g polypropylene, the composite nucleator of 1.2g carbon fiber-attapulgite (carbon fiber:;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 150 ℃ of feeding sections, 180 ℃ of fluxing zones, 190 ℃ of homogenizing zones, 185 ℃ of head temperatures, screw speed is 200rpm; By 250 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle again, then through 10 ℃ of water-bath water-cooleds, in 60 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 5 times, then carries out hot-rolling drawing-off at 120 ℃, drawing-off multiplying power is 4 times, and HEAT SETTING 5min at last 110 ℃, obtains crude polypropylene fiber.
The crude polypropylene fiber equivalent diameter that embodiment 4 prepares is 1mm, and fracture strength is 615Mpa, and elastic modelling quantity is 9550Mpa, and elongation at break is 21 ﹪.
The crude polypropylene fiber performance parameter table that table 1 embodiment 1～5 prepares
As shown in table 1, according to embodiment 1～5 contrast is known, adding organic-inorganic to be re-dubbed after core agent, intensity and the modulus of crude polypropylene fiber all increase significantly, and the crude polypropylene fiber performance preparing is better.
Embodiment 6.
Step (1). attapulgite=20:1), 5g acrylic acid-grafted polypropylene, 1.5g antioxidant b215,1g ultraviolet absorber UV-326 by 90g polypropylene, the composite nucleator of 2.5g carbon fiber-attapulgite (carbon fiber:, be mixed into 100g compound;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 120 ℃ of feeding sections, 150 ℃ of fluxing zones, 180 ℃ of homogenizing zones, 180 ℃ of head temperatures, screw speed is 80rpm; Then by 250 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle, again through 10 ℃ of water-bath water-cooleds, in 60 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 2 times, then carries out hot-rolling drawing-off at 120 ℃, and drawing-off multiplying power is 1.5 times, HEAT SETTING 5min at last 110 ℃, obtains high-strength polypropylene crude fibre.
Embodiment 7.
Step (1). calcium carbonate=1:10), 0.5g acrylamide graft polypropylene, 0.1g antioxidant 168,0.3g ultraviolet absorber UV-327 by 99g polypropylene, the composite nucleator of 0.1g carbon fiber-calcium carbonate (carbon fiber:, be mixed into 100g compound;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 125 ℃ of feeding sections, 155 ℃ of fluxing zones, 185 ℃ of homogenizing zones, 185 ℃ of head temperatures, screw speed is 100rpm; Then by 255 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle, again through 15 ℃ of water-bath water-cooleds, in 65 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 2 times, then carries out hot-rolling drawing-off at 125 ℃, and drawing-off multiplying power is 2 times, HEAT SETTING 4min at last 120 ℃, obtains high-strength polypropylene crude fibre.
Embodiment 8.
Step (1). silica=1:10), 1g methacrylic acid graft polypropylene, 0.4g antioxidant 1076,0.1g ultraviolet absorber UV-328 by 98g polypropylene, the composite nucleator of 0.5g carbon fiber-silica (carbon fiber:, be mixed into 100g compound;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 130 ℃ of feeding sections, 160 ℃ of fluxing zones, 190 ℃ of homogenizing zones, 185 ℃ of head temperatures, screw speed is 150rpm; Then by 260 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle, again through 20 ℃ of water-bath water-cooleds, in 70 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 4 times, then at 130 ℃, carries out hot-rolling drawing-off, and drawing-off multiplying power is 3 times, HEAT SETTING 3min at last 125 ℃, obtains high-strength polypropylene crude fibre.
Embodiment 9.
Step (1). imvite=1:10), 2g glycidyl methacrylate graft polypropylene, 1g antioxidant b225,1g ultraviolet absorber UV-329 by 95g polypropylene, the composite nucleator of 1g carbon fiber-imvite (carbon fiber:, be mixed into 100g compound;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 135 ℃ of feeding sections, 165 ℃ of fluxing zones, 195 ℃ of homogenizing zones, 190 ℃ of head temperatures, screw speed is 200rpm; Then by 265 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as square, again through 25 ℃ of water-bath water-cooleds, in 75 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 5 times, then at 140 ℃, carries out hot-rolling drawing-off, and drawing-off multiplying power is 4 times, finally HEAT SETTING 2min at 130 ℃, obtains high-strength polypropylene crude fibre.
Embodiment 10.
Step (1). imvite=1:5:5), 1.5g maleic anhydride inoculated polypropylene, 1g glycidyl methacrylate graft polypropylene, 1g antioxidant b225,0.5g ultraviolet absorber UV-770 by 94g polypropylene, the composite nucleator of 2g carbon fiber-attapulgite-imvite (carbon fiber: attapulgite:, be mixed into 100g compound;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 140 ℃ of feeding sections, 170 ℃ of fluxing zones, 200 ℃ of homogenizing zones, 195 ℃ of head temperatures, screw speed is 250rpm; Then by 270 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as triangle, again through 30 ℃ of water-bath water-cooleds, in 80 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 6 times, then at 145 ℃, carries out hot-rolling drawing-off, and drawing-off multiplying power is 5 times, finally HEAT SETTING 1min at 140 ℃, obtains high-strength polypropylene crude fibre.
Embodiment 11.
Step (1). silica=1:2:3), 2g maleic anhydride inoculated polypropylene, 0.5g acrylic acid-grafted polypropylene, 1g antioxidant 168,0.5g ultraviolet absorber UV-770 by 94g polypropylene, the composite nucleator of 2g carbon fiber-calcium carbonate-silica (carbon fiber: calcium carbonate:, be mixed into 100g compound;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 145 ℃ of feeding sections, 175 ℃ of fluxing zones, 205 ℃ of homogenizing zones, 195 ℃ of head temperatures, screw speed is 250rpm; Then by 270 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as ellipse, again through 35 ℃ of water-bath water-cooleds, in 90 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 6 times, then at 150 ℃, carries out hot-rolling drawing-off, and drawing-off multiplying power is 6 times, finally HEAT SETTING 30s at 145 ℃, obtains high-strength polypropylene crude fibre.
Embodiment 12.
Step (1). calcium carbonate=1:2:3:5), 1g maleic anhydride inoculated polypropylene, 1g glycidyl methacrylate graft polypropylene, 0.5g acrylic acid-grafted polypropylene, 1g antioxidant 168,0.5g ultraviolet absorber UV-770 by 94g polypropylene, the composite nucleator of 2g carbon fiber-attapulgite-imvite-calcium carbonate (carbon fiber: attapulgite: imvite:, be mixed into 100g compound;
Step (2). compound is joined to double screw extruder and extrude, the processing temperature of double screw extruder is 150 ℃ of feeding sections, 180 ℃ of fluxing zones, 205 ℃ of homogenizing zones, 195 ℃ of head temperatures, screw speed is 250rpm; Then by 270 ℃ of spinnerets spray silks, spinnerets mouth mould is shaped as circle, again through 40 ℃ of water-bath water-cooleds, in 95 ℃ of water-baths, carry out hot water drawing-off, drawing-off multiplying power is 6 times, then at 150 ℃, carries out hot-rolling drawing-off, and drawing-off multiplying power is 6 times, finally HEAT SETTING 15s at 150 ℃, obtains high-strength polypropylene crude fibre.
Above-described embodiment is not that the present invention is not limited only to above-described embodiment for restriction of the present invention, as long as meet requirement of the present invention, all belongs to protection scope of the present invention.
Claims (10)
1. the concrete that contains the composite nucleator of carbon fiber strengthens uses a high-strength polypropylene crude fibre, is blend, it is characterized in that this blend comprises polypropylene, nucleator, bulking agent, antioxidant, ultraviolet absorber; Each raw material strengthens at the concrete that contains the composite nucleator of carbon fiber: polypropylene 90～99 ﹪, nucleator 0.1～2.5 ﹪, bulking agent 0.5～5 ﹪, antioxidant 0.1～1.5 ﹪, ultraviolet absorber 0.1～1 ﹪.
2. high-strength polypropylene crude fibre is used in a kind of concrete enhancing that contains the composite nucleator of carbon fiber as claimed in claim 1, it is characterized in that described polypropylene is the homopolymers of isotacticity >=97 ﹪, and melt index is 3～40g/10min.
3. high-strength polypropylene crude fibre is used in a kind of concrete enhancing that contains the composite nucleator of carbon fiber as claimed in claim 1, it is characterized in that described nucleator is that organic-inorganic is re-dubbed core agent; It is that 1:20～20:1 forms by organic principle and inorganic constituents according to mass ratio that this organic-inorganic is re-dubbed core agent, and wherein organic principle is carbon fiber, and inorganic constituents is one or more in attapulgite, calcium carbonate, silica, imvite.
4. high-strength polypropylene crude fibre is used in a kind of concrete enhancing that contains the composite nucleator of carbon fiber as claimed in claim 1, it is characterized in that the length of described carbon fiber is 2～10mm, and carbon fiber filament number is 0.7～1.5dtex.
5. high-strength polypropylene crude fibre is used in a kind of concrete enhancing that contains the composite nucleator of carbon fiber as claimed in claim 1, it is characterized in that described bulking agent is one or more in maleic anhydride inoculated polypropylene, acrylic acid-grafted polypropylene, acrylamide graft polypropylene, methacrylic acid graft polypropylene, glycidyl methacrylate graft polypropylene; The effect of bulking agent is the compatibility improving between inorganic filler and polypropylene, strengthens interface adhesion, improves the mechanical property of material.
6. a kind of concrete that contains the composite nucleator of carbon fiber as claimed in claim 1 strengthens and use high-strength polypropylene crude fibre, and the antioxidant described in it is characterized in that is a kind of in antioxidant 1010, antioxidant b215, antioxidant 168, antioxidant 1076, antioxidant b225; The effect of antioxidant is to reduce oxidative degradation in crude polypropylene fiber process.
7. a kind of concrete that contains the composite nucleator of carbon fiber as claimed in claim 1 strengthens and to use high-strength polypropylene crude fibre, it is characterized in that described ultraviolet absorber is a kind of in UV-12, UV-326, UV-327, UV-328, UV-329, UV-770, the effect of ultraviolet absorber is the light aging reducing in crude polypropylene fiber use procedure.
8. preparation a kind of concrete that contains the composite nucleator of carbon fiber as claimed in claim 1 strengthens by the coarse-fibred method of high-strength polypropylene, it is characterized in that the method comprises the following steps:
Step (1). first nucleator is dried to constant weight, then by polypropylene, nucleator, bulking agent, antioxidant, ultraviolet absorber, is proportionally mixed into compound;
The concrete that contains the composite nucleator of carbon fiber of preparing 100 weight portions strengthens uses high-strength polypropylene crude fibre, and each amount of substance used is: the polypropylene of 90～99 parts, the nucleator of 0.1～2.5 part, the bulking agent of 0.5～5 part, the antioxidant of 0.1～1.5 part, the ultraviolet absorber of 0.1～1 part;
Step (2). compound is extruded by double screw extruder, and by spinnerets spray silk, then through water hot water or cold water drawing-off, hot-rolling drawing-off, HEAT SETTING, obtain high-strength polypropylene crude fibre;
Described polypropylene is the homopolymers of isotacticity >=97 ﹪, and melt index is 3～40g/10min;
Described nucleator is that organic-inorganic is re-dubbed core agent; It is that 1:20～20:1 forms by organic principle and inorganic constituents according to mass ratio that this organic-inorganic is re-dubbed core agent, and wherein organic principle is carbon fiber, and inorganic constituents is one or more in attapulgite, calcium carbonate, silica, imvite;
The length of described carbon fiber is 2～10mm, and carbon fiber filament number is 0.7～1.5dtex;
Described bulking agent is one or more in maleic anhydride inoculated polypropylene, acrylic acid-grafted polypropylene, acrylamide graft polypropylene, methacrylic acid graft polypropylene, glycidyl methacrylate graft polypropylene; The effect of bulking agent is the compatibility improving between inorganic filler and polypropylene, strengthens interface adhesion, improves the mechanical property of material;
Described antioxidant is a kind of in antioxidant 1010, antioxidant b215, antioxidant 168, antioxidant 1076, antioxidant b225; The effect of antioxidant is to reduce oxidative degradation in crude polypropylene fiber process;
Described ultraviolet absorber is a kind of in UV-12, UV-326, UV-327, UV-328, UV-329, UV-770, and the effect of ultraviolet absorber is the light aging reducing in crude polypropylene fiber use procedure.
9. a kind of concrete that contains the composite nucleator of carbon fiber as claimed in claim 8 strengthens by the coarse-fibred preparation method of high-strength polypropylene, the processing temperature that it is characterized in that described double screw extruder is: 120～150 ℃ of feeding sections, 150～180 ℃ of fluxing zones, 180～205 ℃ of homogenizing zones, 180～195 ℃ of head temperatures, screw speed is 80～250rpm;
The temperature of described spinnerets is 250～270 ℃; Spinnerets mouth mould is shaped as a kind of in circle, ellipse, triangle, square.
10. a kind of concrete that contains the composite nucleator of carbon fiber as claimed in claim 8 strengthens by the coarse-fibred preparation method of high-strength polypropylene, it is characterized in that described water-cooled is for the water-bath quenching through 10～40 ℃ by the polymer melt after spray silk, form low-crystallinity polypropylene fibre, be convenient to obtain higher draw ratio and the degree of orientation in stretching;
The bath temperature of described hot water drawing-off is 60～95 ℃, and drawing-off multiplying power is 2～6 times;
The drawing temperature of described hot-rolling drawing-off is 120～150 ℃, and drawing-off multiplying power is 1.5～6 times;
Described heat setting temperature is 110～150 ℃, and the time is 15s～5min.
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| CN201310411207.3A CN103541036B (en) | 2013-09-11 | 2013-09-11 | A kind of concrete enhancing high-strength polypropylene crude fibre containing the composite nucleator of carbon fiber and preparation method thereof |
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| CN201310411207.3A Active CN103541036B (en) | 2013-09-11 | 2013-09-11 | A kind of concrete enhancing high-strength polypropylene crude fibre containing the composite nucleator of carbon fiber and preparation method thereof |
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| CN104862804A (en) * | 2015-06-03 | 2015-08-26 | 马海燕 | High-strength wear-resistant polypropylene monofilament and production method thereof |
| CN105316788A (en) * | 2015-11-22 | 2016-02-10 | 殷石 | Modified polypropylene crude fiber used for reinforcing concrete and preparation method |
| CN105951204A (en) * | 2016-06-27 | 2016-09-21 | 马海燕 | High-strength polypropylene monofilament and production method thereof |
| CN107354742A (en) * | 2017-06-26 | 2017-11-17 | 中交第公路勘察设计研究院有限公司 | A kind of Cement treated material activated fibre and preparation method thereof |
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| CN103541036B (en) | 2015-10-07 |
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Application publication date: 20140129 Assignee: NINGBO ZHAOBAO MAGNET Co.,Ltd. Assignor: NINGBO INSTITUTE OF MATERIALS TECHNOLOGY & ENGINEERING, CHINESE ACADEMY OF SCIENCES Contract record no.: X2023980030244 Denomination of invention: A high-strength polypropylene coarse fiber for concrete reinforcement containing carbon fiber composite nucleating agent and its preparation method Granted publication date: 20151007 License type: Common License Record date: 20230109 |